Index Properties 4

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1. If size of particle decreases, Plasticity index__________

A) Increases
B) Decreases
C) No change
D) may or maynot decrease

... Answer is A
Size of particles decreases--- liquid limit and plastic limit increases, So does PLasticity index

 

2. If silt or fly ash is added to clay, Plasticity index_________

A) Increases
B) Decreases
C) No change
D) may or maynot decrease

... Answer is B
Silt or fly ash is non plastic materials, fills the voids and hence reduces liquid limit and plastic limit, So deos Plasticity Index
 

3. If Lime is added to Clay

A) Liquid limit increases
B) Plastic limit increases
C) Liquid limit Decreases
D) Borh B and C

... Answer is D
As a result Plasticity index Decreases
 

4. At shrinkage limit degree of saturation is_____

A) 0%
B) 50%
C) 100%
D) None of these

... Answer is C 

 

5. A flat flow curve indicates that soil has_________

A) Low shear strength
B) High shear strength
C) Low compressibility
D) None of these

... Answer is B

 

6. Liquid limit exist only for________

A) Sandy soil
B) Silty soil
C) Clayey soil
D) Gravel

... Answer is C

 

7. Steep grain size distribution represents________

A) Non-uniform grain sizes
B) Grains of all sizes
C) Non- uniform grain sizes
D) None of the above

... Answer is C
It  indicates particles of almost same sizes
 

8. A flat grain size distribution curve shows

A) Narrow range of grains
B) Wide range of grain sizes
C) Uniform grain sizes
D) Certain range of missing

... Answer is B

 

9. Particle size distribution curve with a hump is obtained for ______

A) Unifrom soil
B) Gap graded
C) Well graded
D) Poorly graded

... Answer is B

 

10. In liquid limit test by Casagrande apparatus, the water content for 10 and 100 blows are 40% and 10%. The flow index for soil is_______

A) 10
B) 40
C) 30
D) 50

... Answer is C
If= W1-W2/[logN2/N1]
 

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